Cartridge Of Metal Expansion Cell For Rock Destruction

ABSTRACT

The present invention relates to a cartridge of a metallic expansion cell for a rock destruction which includes a pressure tube that is installed at an inner wall of the casing in the section of the explosion wire and is formed of a certain material having a strong strength capable of enduring against a certain level pressure so that it is possible to prevent an earlier destruction of the casing of the portion near the explosion wire by a high temperature heat and impact wave energy when a large current is applied to the explosion wire, and a plasma channel formed by the explosion wire is guided in the direction of the casing.

TECHNICAL FIELD

The present invention relates to a cartridge of a metal expansion cell for a rock destruction, and in particular to a cartridge of a metal expansion cell for a rock destruction in which a discharge wire is installed at an intermediate portion of a casing for applying a high voltage, and a pressure tube is installed in the interior of the casing in a section in which the discharge wire is installed so that a plasma channel generated by a large current applied from the discharge wire effectively influences a metal expansion cell installed at a lower side of the casing.

BACKGROUND ART

Generally, a certain explosive has been generally used for applying a strong impact to a base rock or a rock and destructing the same in order to enhance an efficiency of work such as a tunnel excavation, a housing complex construction in a city, an explosion at a rock cutting site, a underground construction, a subway construction, etc.

In the conventional art, explosives or dynamites have been generally used for an explosion. However, in the case of an explosive such as a dynamite, there is a certain big danger that they may be exploded due to an inattention, an impact, etc. during a storage and transfer. Once it is exploded, a large explosion sound may occur, so that a surrounding environment is largely influenced.

Recently, in stead of an explosive or dynamite as an explosion material for a rock destruction, a certain fast expansion metal compound has been developed, in which a current is fast discharged to a metal oxide that generates an oxidation reaction, so that a certain medium is expanded for thereby generating a heat during an oxidation reaction of an electrolysis and a metal oxide stored in a cartridge for thereby influencing its surrounding element, whereby a certain object is exploded. The Korean patent registration laid-open No. 213577 and the Korean patent laid-open No. 2003-0006083 disclose the techniques concerning the above fast expansion metal compound.

Namely, the above fast expansion metal compound has been fabricated by mixing a metallic salt that is an oxidizer, a metallic powder that is oxidized by a metallic salt and has a volume increasing due to a heat generation reaction, and a reaction acceleration agent that accelerates an oxidization reaction between the metallic salt and metal powder.

As the metallic salt, there are Fe(NO₃)₃, Cu(NO₃)₂, Ba(NO₃)₄, Mn(NO₃)₄, Mg(NO₃), KNO₃, NaNO₃, Ca(NO₃)₂, etc. As the metallic oxide, there are Fe₂O₃, Fe₂O₄, CuO, MnO₂, Ni₂O₃, PbO, etc.

In addition, as the metal powder, a reduction agent such as Al, Na, K, Li, Mg, Ca, Mn, Ba, Cr, Si, etc. is used.

As the oxidization acceleration agent, there are NaSO₄, MgSO₄, FeSO₄, MgSO₄, NiSO₄, CsSO₄, etc.

As an electric spark induction electrolyte for accelerating an oxidation between the metallic salt and metal powder, a small amount of ammonium borate, nitrate, sulfate, etc. is melted into glycerin such as ethylene glycol and alcohol.

Namely, the fast expansion metallic compound in which the above materials are mixed by proper mounts are stored in a vinyl paper or cartridge by a small amount and are positioned at an explosion hole, so that a large current is applied to a container that has the fast expansion metallic compound in accordance with a remote switch operation. However, when the fast expansion metallic compound is stored and used in the vinyl paper, a certain set pattern and standardization cannot be achieved. Therefore, the fast expansion metallic compound has been generally stored and used in the cartridge.

FIG. 4 is a view illustrating the construction of a conventional cartridge of a metallic expansion cell for a rock destruction. The conventional cartridge 10 of a metallic expansion cell for a rock destruction includes a cylindrical casing 11 for storing a metallic oxide therein, an upper cap 12 and a lower cap 13 for capping the upper and lower sides of the casing 11, a terminal 14 for applying a large current to a medium disposed in the interior of the casing 11, and a power supply unit 17 and an electric cable 16 for supplying the current to the terminal 14. A certain gap is formed between the terminals 14 of both sides. An explosion wire 15 formed of an aluminum wire, etc. is connected between the ends of the terminal 14.

Therefore, the large current flows between the terminals 14 based on a switching operation of the power supply unit 17, and the explosion wire 15 is discharged for thereby forming a plasma channel. The volume of the metallic expansion cell 20 is fast expanded for thereby increasing the explosion hole during a flame oxidation reaction of the metallic expansion cell 20 by a high temperature heat and energy occurring at the plasma channel.

In the case of the conventional cartridge storing the metallic expansion cell therein, since the metallic oxide near the explosion wire first generates an oxidization reaction at the time when a high pressure occurs at the explosion wire, the casing is destructed before the metallic oxide stored at the lower side of a cylindrical and longitudinal casing is fully reacted. Therefore, since only the metallic expansion cell positioned at the upper side of the casing among the metallic expansion cell stored in the cartridge reacts, it is impossible to obtain an enough expansion pressure.

In addition, since the explosion wire is connected shorter in the diameter direction of the cylindrical casing, the discharging efficiency with respect to the metallic oxide is not enhanced. In the case of the conventional cartridge of the metallic oxide for a rock destruction, micro particle oxides fill the gaps between the oxides positioned at the lower side of the casing during the storage of the metallic oxide in the interior of the cylindrical casing or the time needed for the movement is passed, so that the oxides at the lower side of the cylindrical casing get hardened, and an air layer is formed at the upper side of the casing. Therefore, the performance during the discharge with the explosion wire and the oxidation reaction is decreased.

DISCLOSURE OF INVENTION

Accordingly, it is an object of the present invention to provide a cartridge of a metallic expansion cell for a rock destruction capable of overcoming the problems encountered in the conventional art.

It is another object of the present invention to provide a cartridge of a metallic expansion cell for a rock destruction in which a discharge wire is installed at an intermediate portion of a casing for applying a high voltage, and a pressure tube is installed in the interior of the casing in a section in which the discharge wire is installed so that a plasma channel generated by a large current applied from the discharge wire effectively affects a metal expansion cell installed at a lower side of the casing.

To achieve the above objects, in a cartridge of a metallic expansion cell for a rock destruction in which a metallic expansion cell mixed with metallic salt, metallic powder, metallic oxide, etc. is received in a casing, and an explosion wire is formed in the metallic expansion cell stored in the interior of the casing for discharging large current, and the large current supplied from the power supply unit is inputted into the both ends of the explosion wire, there is provided a cartridge of a metallic expansion cell for a rock destruction, comprising a pressure tube that is installed at an inner wall of the casing in the section of the explosion wire and is formed of a certain material having a strong strength capable of enduring against a certain level pressure so that it is possible to prevent an earlier destruction of the casing of the portion near the explosion wire by a high temperature heat and impact wave energy when a large current is applied to the explosion wire, and a plasma channel formed by the explosion wire is guided in the direction of the casing.

BRIEF DESCRIPTION OF DRAWINGS

The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein;

FIG. 1 is a cross sectional view illustrating a cartridge of a metal expansion cell for a rock destruction according to the present invention;

FIG. 2 is a disassembled perspective view illustrating a cartridge according to the present invention;

FIG. 3 is a view of a state that a cartridge of a metal expansion cell for a rock destruction is used according to the present invention; and

FIG. 4 is a view for describing a conventional art.

BEST MODE FOR CARRYING OUT THE INVENTION

The construction and operation of a cartridge of a metallic expansion cell for a rock destruction according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a cross sectional view illustrating a cartridge of a metal expansion cell for a rock destruction according to the present invention, FIG. 2 is a disassembled perspective view illustrating a cartridge according to the present invention, and FIG. 3 is a view of a state that a cartridge of a metal expansion cell for a rock destruction is used according to the present invention.

In the drawings, reference numeral 30 represents a cartridge of a metallic expansion cell for a rock destruction according to the present invention. Here, the cartridge 30 includes a cylindrical and longitudinal casing 31, an upper cap 32 that caps an opened upper side of the casing 31 and has fixed terminals 41 and 42 for receiving current, and a lower cap 34 for capping an opened lower side of the casing 31.

A pair of fixed protrusions 41 and 42 are protruded from the lower side of the upper cap 32 in the direction of the interior of the casing 31 for inputting the powers (+) and (−) of a power supply unit 50. The fixed terminal 42 of one side is extended longer than the fixed terminal 41 of one side, so that the explosion wire 44 connecting both ends of the same is formed diagonal with respect to the longitudinal direction of the casing 31. In particular, the outer circumference of the fixed terminal 42 fixed longer is inserted into a guide 33 extended integrally with the upper cap at the lower side of the upper cap 32 and is protected thereby. Namely, the both sides of the upper cap 32 are extended so that the fixed terminals 41 and 42 are inserted in parallel from each other. The guide is downwardly and longitudinally extended from the side in which the longer terminal is inputted.

The upper ends of the fixed terminals 41 and 42 are protruded in the direction of the upper cap 32 in a certain section based on a cannon plug type, so that the end of the electric cable connected with the power supply unit 50 gets connected. The ends of the electric cables 51 and 52 are connected with a connector 53, respectively, that is easily detachable from the upper ends of the fixed terminals 41 and 42. The connector 53 surrounds the upper ends of the fixed terminals 41 and 42 protruded in the cannon plug type and is detachably slidable up and down. In addition, a vinyl cap 54 is capped on a contact point in a state that the connector 53 is connected with the upper ends of the fixed terminals 41 and 42.

In the cartridge 30 of the metallic expansion cell for a rock destruction according to the present invention, the explosion wire 44 is arranged at a certain inclination angle, the section in which the explosion wire 44 is positioned at the casing 31 is more widened as compared with the conventional art.

In addition, a cylindrical pressure tube 35 formed of a certain high strength material capable of enduring a certain pressure is insert-injected from an inner circumferential surface of the casing 31 in the section of the explosion wire 44. The pressure tube 35 is installed at the intermediate portion of the casing 31 for the reason that when the large current is applied to the explosion wire 44, the metallic expansion cell 60 near the explosion wire 44 among the metallic expansion cells 60 filled in the interior of the casing 31 is first reacted, so that it is possible to prevent the casing 31 in the section of the explosion wire 44 from being first destructed before the reaction heat is transferred to the metallic expansion cell 60 positioned at the lower side of the casing 31. The pressure tube 35 is preferably formed of a stainless material having a strong anti-corrosion property.

Namely, the portion of the casing 31 in the section of the explosion wire 44 is supported by the pressure tube 44, so that the destruction of the casing 31 in the section of the explosion wire 44 is delayed, and the plasma channel generated by the explosion wire 44 is guided and extended up to the metallic expansion cell 60 at the lower side of the casing 31.

A circular plate 36 is disposed at the lower inner side of the casing 31 and is elastically supported by the inner surface of the lower cap 34 and the spring 37, and a metallic expansion cell 60 is stored at the upper side of the circular plate 36. Namely, the spring 47 elastically supports the weight of the metallic expansion cell 60. The weight of the metallic expansion cell 60 is supported using the spring 37 for the following reasons. The medium is moved up in the casing 31 as the circular plate 36 is moved up by an elastic force of the spring 37, so that it is possible to prevent the formation of the air layer at the upper side of the casing 31 as compared to the conventional art in which the air layer is formed at the upper side of the casing 31 as the micro metallic particles are filled in the spaces between the particles of the metallic expansion cell 60.

In addition, the engaging portions between the upper cap 32 and the lower cap 34 engaged at the upper and lower sides of the casing 31 are sealed.

The method of use and operation of the cartridge of a metallic expansion cell for a rock destruction according to the present invention will be described.

In the cartridge 30, the explosion hole 70 is formed at an explosion position using certain equipment such as a drilling machine, etc. The connector 53 of the electric cables 51 and 52 extended from the power supply unit 50 is connected with the upper sides of the fixed terminals 41 and 42 extended from the upper cap 32 of the cartridge 30.

The switch for controlling the supply of the large current to the power supply unit 50 and the cartridge 30 includes the electric cables 51 and 52, so that the cartridge 30 can be exploded at a remote site.

When an explosion manager turns on the switch, the power of the power supply unit 50 is supplied to the explosion wire 44, and the large current of high voltage is discharged to the explosion wire 44, and a plasma channel is formed. A high temperature heat and high pressure energy are transferred to the metallic expansion cell 20 near the explosion wire 44. Therefore, the metallic expansion cell 20 filled in the interior of the casing 31 is reacted with respect to the explosion wire 44 based on a high temperature reaction heat and is oxidized and expanded for thereby outputting a high temperature heat and energy. The above energy expands the explosion hole for thereby destructing the explosion object.

Since the pressure tube 35 having a strength higher than the casing 31 is installed at the inner wall of the casing 31 in the section of the explosion wire 44 in the cartridge 30 according to the present invention, the destruction of the casing 31 in the section of the explosion wire 44 is delayed so that a normal reaction is performed even at the metallic expansion cell 20 filled at the lower side of the casing 31 as compared to the conventional art. In addition, the plasma channel is guided to the lower side of the casing 31. Therefore, it is possible to obtain energy theoretically similar with the explosion energy obtained by the metallic expansion cell 20 filled in the interior of the casing 31.

Since the explosion wire 44 is longitudinally and diagonally formed, so that the surface area of the metallic expansion cell 44 is widened for thereby receiving a high temperature reaction heat at the initial stage from the explosion wire 44.

In the case of the cartridge 30 of a metallic expansion cell for a rock destruction according to the present invention, since the weight of the metallic expansion cell 20 filled in the interior of the casing 31 is elastically supported by the spring 37, even when micro particles are inserted into the gaps between the metallic expansion cell stored in the interior of the casing during the storage and movement of the cartridge 30 having the metallic expansion cell therein, the air layer is not formed at the upper side of the casing 31.

The method for connecting the connector 53 of the electric wires 51 and 52 with the fixed terminals 41 and 42 of the cartridge 30 is easily performed at the explosion work site, so that the workability is enhanced.

INDUSTRIAL APPLICABILITY

As described above, in the cartridge in which a metallic expansion cell for a rock destruction is filled according to the present invention, the intermediate portion of the casing having the explosion wire therein is surrounded by the pressure tube, so that almost metallic expansion cells filled in the interior of the casing are reacted for thereby achieving a larger expansion pressure. As the explosion wire is positioned in the diagonal direction, the volume of the metallic mixture to which a reaction heat is transferred from the explosion wire at an initial stage is more largely increased, as compared with that the explosion wire is positioned in the axial direction of the casing. In addition, since the weight of the metallic mixture is supported by the spring during the storage and movement of the cartridge filled with the metallic mixture, it is possible to prevent the air layer from being formed at the upper side of the casing.

As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims. 

1. In a cartridge of a metallic expansion cell for a rock destruction in which a metallic expansion cell mixed with metallic salt, metallic powder, metallic oxide, etc. is received in a casing, and an explosion wire is formed in the metallic expansion cell stored in the interior of the casing for discharging large current, and the large current supplied from the power supply unit is inputted into the both ends of the explosion wire, a cartridge of a metallic expansion cell for a rock destruction, comprising: a pressure tube 35 that is installed at an inner wall of the casing 31 in the section of the explosion wire and is formed of a certain material having a strong strength capable of enduring against a certain level pressure so that it is possible to prevent an earlier destruction of the casing 31 of the portion near the explosion wire 44 by a high temperature heat and impact wave energy when a large current is applied to the explosion wire 44, and a plasma channel formed by the explosion wire is guided in the direction of the casing
 31. 2. The cartridge of claim 1, wherein a circular plate 36 is disposed in an inner space of the lower side of the casing 31 and is elastically supported by a spring 37, wherein the casing 31 is designed to receive the metallic expansion cell 60 from the upper side of the circular plate
 36. 3. The cartridge of either claim 1 or claim 2, wherein two fixed terminals 41 and 42 are protruded in the direction of the inner side of the casing 31 at the lower side of the upper cap 32 adapted to cap the upper side of the casing 31, and the fixed terminal 42 of one side is formed longer, and the fixed terminal 41 of the other side is formed shorter, and the explosion wire 44 connected with the fixed terminals 41 and 42 is formed diagonally with respect to the longitudinal direction of the casing
 31. 4. The cartridge of either claim 1 or claim 2, wherein the upper side of the fixed terminal is protruded in a cannon plug type for a detachable engagement of the electric wire connected with the power supply unit at the upper side of the upper cap
 32. 